Method and apparatus for doing hectograph and other printing



July l, 1941.l F. R. BARTHoLoMl-:w

METHOD AND APPARATUS FOR DOING HECTOGRAPH AND OTHER PRINTING Filed April as, 195s s sheets-sheet 1 July 1, 1941.

F. R. BARTHOLOMEW METHOD `AND APPARATUS FOR DONG HECTOGRAPH AND OTHER PRINTING Filed April 25, 1938 3 Sheets-Sheet 2 July 1, 1941.

F. R. BARTHOLOMEW `METHOD AND APPARATUS FOR DOING HEC-TOGRAPH AND OTHER PRINTING 3 Sheets-Sheet 3 Filed April 23, 1938 uummmuuumnmmunuumnmunud lllllllllllllllll Illllllllll 000000000 onOoo o 0000000 oooov oo ooOooooo o0 o L -f 117/42, Z

[weer/vrafr Patented July 1, 1941 UNITED AsTATlizs PATENT METHOD ANDT APPARATUS. Fon Doma f HEo'roGRAPH AND OTH-ER- PRINTING Fred R. Bartholomew, Minneapolis', Minn.

Application April 23, 1938', Serial. 20339132 Claims. ,(Ql. lOl-131) rlhis invention relates to anew and improved method and device for doinghectograph printing, the device also comprising a combination uponA which stencilprinting may be done. The invention is particularlydirected to such a combination comprising rotating members forming in effect la rotary press.

At present hectograph printing is done either on a flatv bedpress or on a rota-ry cylinder press. In both types of presses a gelatin lm is carried on a member and the material to be printed is pressed against this film and is later stripped or pulled therefrom. To prepare said film for the printing operation a master copy carrying an image in hectograph ink is placed face down on the hectograph gelatin film and allowed to remain there under slight pressure until the gelatin film has absorbed a considerable part of the hectograph ink.v The master copy With the remainder of the hectograph ink thereon is then removed from the'gelatin film andthe value of the master copy is wasted to the extent of the` ink that remains on it. After this hectograph inkv has been absorbed by the gelatin film or transferred thereto as described this ink in the printing process is transferred by the gelatin lmto successive sheets of paper brought into engagement with the fil-m. This is continued until the prints on said paper finally become too faint to be usable. With this method now in use therefore, all of the ink is not transferred from the master copy to the film and the sheets of paper that take the first impressionsn from the gelatin lm will have very dark or heavy printing thereon and the sheets of paper that take the last impressions from the gelatin lm will have correspondingly light printing thereon.

Furthermore, the printing done on the at press above referred to is all hand work and therefore very slow. On the rotary cylinder press the speed of production can be increased considerably. However, one requirement of hectograph printing is that the print must remain on the gelatin film until sufficient ink has been transferred from the gelatin to the paper or other material. This necessitates that the paper must follow the gelatin film around the cylinder sufliciently long for the desired amount of ink to be transferred from the gelatin. It is true that under present methods the cylinder may be revolved very fast at first and satisfactory production obtained because the first prints need only remain on the gelatin for a very short time. However, as the ink is used olf from the gelatin the paper must remain thereon for a longer time if a satisfactory print is to' be' obtained. The

prese-nt method therefore, iseither to slow upthe speed of the` cylinder after the print appears toolight or to allow the paper to remain upon theV cylinder and gelatin'- for several revolutions before strip-ping the paper therefrom'. Obviously either of these methods reduces the production. Due to the fact thatheavy cardboard will not bend around the cylinder such cardboard cannot be printed onarotary or cylmder type hectograph press. I Y

It: isv an-Mobject of! this invention, therefore, to provide a novel method andapparatus by means of which the paper or material-tobe printedA may' remain in contact with the. gelatin for a longer or shorter periodi without reducing the-speed-y of production.. I Y Y It is also an object ofthe invention toL provide a machine by wl-iiche-bothstencil andi hectograph printing may: be done. f v

It is still further an 'object of this invention to provide an attachment. byftlsiev use of which prints rmatdey from a gelatin film-will not vary as to intensity as under' the present methods and by the use of whichy a greater amount of? the can ybe taken from the master copy.

It isstill another object of the invention to provide a simple and-efficient nectograph rotary printing machine upon which heavy cardboardthat will not bend around the cylinder may be printed;

Thesev andother obiects and advantages of the invention willy beI fully set -forthin the following descriptio-nmade in connection withl the accompanying drawingsfin whicl-iy like reference characters refer t-osimi-lar parts: throughout the several views and in which:

Fig. 1 is a view in side elevation of the device;

Fig.-2 is a partial viewr inside elevati-on of a modied form of the device;

Fig. 3 is av-iew in vertical section of the device shown in Fig. 2k taken substantially midway of the machine; f

Fig-.4 is a view in vertical Ysection taken substantially on line- 4;-4 of" Fig.V 7;

Fig.,5 is a partial view similar to Fig. 4 on an enlarged scale; f

Fig. 6' isl a view inl verticalsection taken substantially midway of a modified form of the machine;

Fig-7 is a view in end elevation of the machin shown in Figs. 1- and 4';

Fig. 8 is a plan view of a portion of the lbelt used; and Y Figi. 9-isan end view'of' a/ segmental cover used.

shown Referring to the drawings, particularly Figs. l, 4 and '1, a machine is shown comprising a frame member I5 having spaced side portions I5a in which is journalled a shaft I6 on which a cylinder or drum frame I1 is mounted. Frame I`I comprises a pair of laterally spaced rings Ila having hub portions and a plurality of arms I1b connected thereto. A cylinder I8 having a peripheral surface overlies and extends between the rings I1a, said cylinder being formed by a segment |811. extending through substantially half the circumference of rings lla. A segmental plate Ib engages the end of segment lila and completes the periphery of cylinder I8. Shaft i6 may be rotated by power or by hand in any suitable manner as by a crank handle 20 secured to the end thereof at the outer side of one of the end portions I5a. A gear 2l is secured to shaft I6 adjacent one of the end members 15a. and this gear meshes with a gear 22 secured to a drum or cylinder 23 carried on a shaft 24. Shaft 24 is mounted at its ends in auxiliary frame members 25 having base portions 25a. secured to the top of each side member I5 as shown in Fig. l. Members 25 will be secured by suitable screws 26. Members 25 have standard portions 25h, the same being provided with open ended slots 25e in their upper ends. Shaft 24 has end portions rectangular in cross section adapted to fit and slide vertically in the slots 25o and which are thus held from rotation. Screws 21 extend through the end portions of shaft 24 and engage the members 25h, said screws having suitable hand wheels 21a. at their upper ends. Shaft 24 can thus be adjusted vertically. The drum 23 is rotatably mounted on shaft 24 and gear 22 is secured to said drum by a plurality of circumferentially spaced screws 28. Drum 23 may be perforated for substantially half of its periphery and the other half of said periphery comprises a removable segment 23h overlyingl offset extensions 23a of the drum 23 and suitably secured thereto by screws 29. A platen roll 3i] has trunnions journalled in the side members of the frame I5 and extends between the same, the surface of said roll being a short distance below the bottom of the cylinder member I8. A feed table 3l is also mounted in frame I5 beneath said drum and extends toa point adjacent roll 39, the top surface of said table being substantially in the same plane as the top surface of roll 30. Another frame member 32 is provided having substantially the same width as frame I5 `and said frames will be mounted upon some suitable rigid base member 33. One or both of said frames may be arranged for guided sliding movement on said base. Frame 32 has spaced side portions 32a. and a shaft 33 is journalled in and extends between said side portions, the same having rigidly secured thereto a cylinder or drum 34. Shaft 33 also has a crank handle 35 secured to one of its ends just outside one of the frame members 32a. by means of which it can be rotated. A belt 36 is arranged to pass over and between the cylinder 34 and the cylinder I8. This belt has thereon spaced gelatin films 31 such as commonly used in hectograph printing. Films 31 are shown as having rectilinear adjacent edges extending at right angles to the edge of belt 35. Said belt preferably has formed therein a series of openings 36a adjacent one edge adapted to t over suitable teeth or projections IBC carried on and adjacent the edge of cylinder I8. Cylinder 34 has secured at one end a gear 35 meshing with a gear 39 secured to a stripping roller 49 carried on shaft 4Ii said shaft having its ends journalled in frame members 32a. Gear 39 meshes with another gear 42 secured to a stripping roller 43 spaced a short distance from roller 45. Roller 43 is carried on a shaft 44 having its end portions journalled in frame members 32a. Cylinder 34 also has therein at one end teeth 34a for engagement in openings 35a of belt 36.

A feeding table 45 may be provided adjacent the upper side of cylinder I8, the same being carried by bars 46 secured to the side thereof and secured to the outer sides of frame members |50. and |55. An angle bracket 41 may also be secured to the ends of frame members I5a and 15b, the same projecting outwardly some distance over table 45. A scraper or presser member 48 is secured to member 41 and depends therefrom to a point adjacent belt 36. Member 48 has a rounded lower edge disposed in a plane a short distance above the top of feeding table 45 or in a line disposed substantially at the top of the gelatin film as it passes around the cylinders. It will be understood that member 48 extends across the entire width of the lm 31 and preferably a short distance at either side.

In Fig. 4 a plurality of sheets of material 49 and 5i! are shown attached to drum 23 representing respectively an absorbent sheet and a stencil and while these can be held on said drum in various ways in lthe embodiment of the invention illustrated they are shown as held by the ends of segment 23h where it overlaps the portions 23a and is held by the screws 29.

Frames I5 and 32 will preferably be mounted for relative movement toward and away from each other and some resilient means preferably will be provided relatively to move said frames apart. X/Vhile various means could be provided, in the embodiment of the invention illustrated a rod 55 is shown of cylindrical form which may be flattened at one end and secured to frame i5 in any suitable manner as by a screw 56. Rod 55 at its other -end extends into and is slidable in a tube 51 which also may be flattened at one end and secured to frame 32 in any suitable manner as by the screw 58. Rod 55 is threaded at 55a and a collar 59 is disposed on said rod with which engages a nut 6D threaded on portion 55a. A collar 6I is secured on tube 51. A compression coiled spring 62 surrounds tube 51 having one end engaging collar 6I and its other end engaging collar 59. With this arrangement it will be seen that spring 62 acts to move frames I5 and 32 away from each other and belt 36 will thus be suitably tightened or kept under the desired degree of tension. If desired, a member 55 and a member 51 with the attendant structure may be disposed at each side of the frames I5 and 32.

The machine may be furnished without brackets 25 and the parts carried thereby and only bracket 41 used. The resilient scraper or pressure member 48 secured to the undersurface of bracket 41 will be used and as stated, its edge is disposed in a line a slight distance above the top of feeding table 45 or substantially at the top of the gelatin lms which move thereunder.

In operation, when offset hectograph printing is to be done a master copy will be made represented by sheetl 49 as shown in Fig. 4. It will be understood that stencil 50 is not used at this time. The hectograph ink will be, of course, applied to the outer side of sheet 49. The belt 36 is now driven by the operator turning either crank 26 or 35. A sheet of paper 53 can now te fed from tatie ai over the platen` rou au; in wilI-beunderstood that platenl roll 3D merely revolves' freely and is not positively driven. Any of the well known paper feeders now inV use inthe `art may be used if desiredto Afeed the paper the desired distance. The paper is fed a certain distance over the top of platen roll 3l)Y and is then engaged by the forward' edge of one of the nlm-s 31. Said paper will adhere to said film and be carriedaloh'g thereby. As the films 31 pass between cylinders I3 andv 213 the image from the master copy 49 is successively transferredV to 'said gelatin films. When a lm 31 passes around cylinder I8V and engages the paper 53, said paper is pressed against' the film by theplaten roll 301. The gelatin film vis quite adhesive and the paper remains thereon and passes along the lower run of belt 36. The image is thustransferred bythe lm to the paper. The portion of the paper which is projecting beyond thefgelat'in 'hlm moves to' and i'sy engaged by the stripping rollers 40 and i3 which are beiner rotated by gears 38, 39 and 42 and asl the belt and gelatin fil-'mmove 'around the cylinder 34 the paper is thus stripped from the film. The machine can thus be used to do heetograph printing in an offset manner. If cardboard is to be printed itis similarly fed on the table 3l some distance over the top of platen roll 30 and is then engaged by the gelatin film. The cardboard will be pressed against the film by roll 30 and will adhere tov said film and be carried along therewith. The lm and cardboard advance until cylinder 34 is reached, and the cardboard being sti-ff', then continues to move in the same straight line and' it may be stripped by rollers 4D and 4-3 or it may simply pass forward and be dropped by vthe machine without any stripping mechanism bein-g 'used'. The paper or cardboard can be kept in contact with the Agelatin film 'a longer 'time by lengthening theV belt 36.

The paper may also be fed to the machine from the table 45. When so fed it will remain in contact with the gelatin for a longer period of time than when fed from table 3|. This -ma'y be desirable when the copies become somewhat lig-hteror weaker, as when the master Ycopy has been used for a considerable time -or when the ink on the lms 31 has been used for quite a period if the offset method isV not used.

The paper may be moved forward on table 45 by hand or with any desirable feeder 'now known in the art until the paper is in position to contact the end of the gelatin film as it passes around the cylinders. The paper is fed into this position after onegelatin film has passed and before the next 'nlm has arrived at this point occupied by the end of the paper. The paper may be fed to 'the point when it touches the non-adhesive portion of the belt between the gelatin films. *With the paper thus positioned, it is engaged by the forward edge of the gelatin nlm moving upwardly over cylinder I8 and will be pressed against said gelatin film by the scraper or presser 48 Which will vengage the side of the paper across the entire width thereof. Scraper- 48 will be flexedor bent somewhat as indicated in dotted lines in Fig. l. The paper then continues around` cylinder I8 and will be stripped from the gelatin fil-m upon reaching the rol-lersl vand "43 -as already described. Said paper will -merely be pressed against the gelatin nlm as itpasses Yover roll 30. -It is understood that Vthe presser 48and the platen -roll 8l! may 75 be iised interchangeably for the same purpose er pressing the paper onto the gelatin l'm.

The cylinder l'8 shown and described may be the lwell known cylinder of a standard duplieating 'machinenow commonly used in the art such as a V"lVIultigraph or Mimeograp inachine. Such a machine can thus be converted intothe present machine. Many of such d'uplli eating or stencil machines have a complete cylinder while other machines have only a` segment of a cylinder on which to place the stencil as above described. It is, of course, apparent that the' present machine is not limited to the structure of a standard or other type of duplicating or stencil machine. The use of a stencil machine with this invention would save the user the 'cost' of supplying a revolving cylinder. Also to thosel users who have no stencil" machine but wish to do stencilvand hectograph printing the machine as shown in the drawings and specificationcould be supplied.

A further method Vof doing both hectogiaph and stencil printing on this machine at the same timeI could be accomplished by placing the stencil- 5Dy over an absorbent sheet which would replace sheet 4B on the cylinder 23, the said absorbent sheet being supplied with ink in any '-of the-'usual ways. The cylinders 23 and I8 would then be revolved in unison as described and a Sheet of paper cou-ld be fed onto the gelatinl vfilm from feeding table 45. As this paper sheet passed under the cylinder 23 itr would be printed bythe stencil thereon. The sheet of paper wouldv thus be printed on one side by the stencil and would be printed on the opposite side by one of the heotograph gelatin lms 31.

In the formshown in Figs. 2 and 3 and when a master copy is not used on cylinder 23 the image would be transferred to the gelatin film in the manner now common by placing the master :copy thereon for a certain period. The paper will be fed from the table45 as already described or the paper or cardboard may be fed from the table 3l with which the machine will be provided as shown i-n Figs. 1 and 4. The paper will beA stripped from the gelatin films in the manner already described.

"In Fig. 6 a frame 65 is shown which like frame l5, will have side portionsin which is jz'iurnallfed a shaft 86 similar to shaft i6. A cylinder 61l having thereon a segment 58 and a segment 68a completing a cylinder `is carried on shaft 66. Shaft G6 will be provided with suitable means for rotation as 'already indicated. vAnother frame member 10 is provided which like lframe member i5 will have spaced side portions in which is journalled a shaft 11|. A cylinder 12 having segments V1-3 and 13a will be carried on member 12. A belt 14 is provided which runs around the cylinders `68 and 13. This belt will have thereon spaced gelatin films 15 similar tothe nlms 371. Platen rollers 16 and 11 are lprovided adjacent cylinders `68 and 13, roll 16 being 'at the bottom of cylinder 58 and carried on a shaft 18 journaled at its end-s in v'the sides of frame 65. Roll 11 is disposed at the top Vof cylinder 13 and is carried lon the shaft 19 which will be journaled in suitable lugs forming part of frame member` 10. A feeding table is carried by frame 65 shown at lthe left of plate roll -16 and a feeding table V8l is vshown `adjacent roll 13 and 'at the right of plateniroll 11. A pair of stripping rollers 82 and 83 are mounted onsh-ats 84 and 855 respectively which will be mounted in portions of frame t5. Rollers -82 and 63 may be rotated by some suitable mechanism (not shown), such as the gears shown in Fig. 1. Another pair of stripping rollers B6 and 81 are shown at the lowerrpart of cylinder 13, said rollers being carried on shafts 88 and 89 respectively journaled in frame 10. Rollers 86 and 81 will be preferably rotated by some suitable mechanism (not shown) similar to that for rotating rollers 40 and 43.

Frames 65 and 'IB will rest upon some suitable base or support and will preferably be arranged thereon for relative movement toward and from each other. Preferably the frames are urged apart by a resilient means to properly tension belt 14. While various mechanisms could be used for this purpose, in the embodiment of the invention illustrated a rod 9i) is provided shown as flattened at one end and secured to frame 65by some suitable means such as the screw 9|.y 92 in which it is slidable, said tube being shown as having its remote end flattened and secured to frame 10 in some suitable manner as by the screw 93. Rod 90 is threaded as shown at 90a and a collar 94 surrounds said rod, the same being engaged by a nut 95 on the threaded portionv 90a. A collar 95 is secured to tube 92 in any suitable manner and a coiled compression spring 91 surrounds tube S2 having one of its ends engaging collar 96 and its other end engaging collar 94. With this construction it will be vseen that spring 91 will urge frames (i5 and 'lapart thus tensioning belt 14. 'Ihe degree of compression of spring 91 may be regulated by adjustment of nut 95. If desired, there may be one of the rods 90 and tubes 92 with the attendant parts at each side of the frames B5 and 10.

In operation of the device shown in Fig. 6 the paper may be fed from table 8| to a point a short distance beyond roll 'Il by hand or by some suitable automatic feeder. The paper will be engaged by a film as the latter rotates with cylinder 12, and pressed thereagainst by platen roll 11. The paper will be carried along on film l5 and may then be stripped by the stripping rollers 82 and 83. If desired, the stripping rollers 82 and 83 may not be used and the paper will continue on the belt passing between platen roll 'I6 and the film and will then be stripped by the stripping rollers 86 and 8l. In the latter case the paper will remain on the gelatin iilm for quite a long period. A good print will thus be insured. Paper may also be fed simultaneously from both the tables 80 and 8| to the films 15, the paper being fed from table 8| being stripped by rollers 82 and 83 and the paper being fed from table 8i) being stripped by rollers 85 and 8l. With such operation the production of prints will be doubled. It will also be seen that cardboard may be fed from either or both tables 8i) and 8| and be printed by the gelatin films. The length of the belt 'I4 can be such that the paper or cardboard will remain on the gelatin film for the desired period. The lengthened belt could be run at the same Rod 9U at its other end extends into a tube CII tilinear and extend transverselyof the machinel perpendicular to the edge of or the direction of travel of the belt. These edges of the films may in some operations act as gauges for the ends of the sheets being printed.

From the above description it will be seen that I have invented a very simple and eicient hectograph printing apparatus of the rotary press type. The apparatus can be used for performing several methods of hectograph printing as Well as being used for stencil printing. As above set forth, the printed material may be simultaneously printed on both sides. In doing hectograph printing the ink on the master copy is much more eniciently used than in the methods and machines of the prior art. More uniform prints are also produced than in previous methods of hectograph printing. With the present apparatus cardboard can be very readily printed and easily stripped from the printing members. By having the travelling belt constructed and arranged to engage teeth on one or both of the cylinders over which it travels a very accurate movement of the belt is produced and any slipping is prevented. It is also an important feature of the invention that the apparatus may be constructed from machines now commonly used such as the Multigraph or Mimeograph machines so that a much greater range of operation and usefulness for such machines is secured.

The method and apparatus have been amply demonstrated in actual practice and found to be very successful and eiicient.

rIt will, of course, be understood that various changes may be made in the form, details, ar-

' rangement and proportions of the apparatus and speed and it would thus not be necessary, as in in the steps and sequence of steps of the method without departing from the scope of applicants invention, which generally stated, consists in a method and apparatus capable of carrying out the objects above set forth, such as disclosed and dened in the appended claims.

What is claimed is:

1. In a machine of the class described having in combination, two cylinders, a belt having spaced sections of hectograph gelatin composition thereon, said belt passing around and connecting the two cylindersand revoluble with said cylinders, images in hectograph ink in reverse on said sections of hectograph gelatin composition, means for pressing sheets of paper onto the said sections and against said images and means for stripping the said sheets of paper from said sections.

2. In a machine of the class described, the combination of a frame, two cylinders having peripheral surfaces, a belt having an outer surface of a hectograph gelatin composition and contacting on its inner surface the peripheral surfaces of the said cylinders and revoluble with the said cylinders, a supplementary cylinder secured to said frame adjacent to one of said cylinders, means for rotating the last two mentioned cylinders in contact with each other and at the same speed, said supplementary cylinder having a peripheral surface adapted to receive any one of a number of interchangeable printing members carrying images in hectograph ink, and means for securing one of said printing members to said peripheral surface.k

3. In a machine of the class described, the combination of a frame, two cylinders having peripheral surfaces, a belt having sections of gelatinv hectograph composition on its outer surface and contacting on its inner surface the peripheral surfaces of the said cylinders and revoluble with the said cylinders, images in hectograph ink in reverse on one or more of said sections, a plurality of means for pressing a sheet of paper onto each of said sections and images, said means being located at different points on said frame and means for each of said means for stripping the same sheets of paper from the sections of gelatin hectograph composition.

4. In a machine of the class described, the combination of a frame, two cylinders having peripheral surfaces, a belt having sections of gelatin hectograph composition on its outer surface and contacting with its inner surface the peripheral surfaces of the said cylinders and revoluble with said cylinders, a supplementary cylinder secured to said frame adjacent to one of said cylinders, means for rotating the last two mentioned cylinders substantially in contact with each other and at the same speed, said supplementary cylinder being hollow and having a perforated peripheral wall, a stencil on the outer surface of the said perforated peripheral wall and means for inking said stencil.

5. In a machine of the class described, the combination of a frame, two cylinders having peripheral surfaces, a belt having sections of gelatin hectograp-h composition on its outer surface and contacting with its inner surface the peripheral surfaces of the said cylinders and revoluble with said cylinders, a supplemental cylinder secured to said frame adjacent to one of said cylinders, means for rotating the last two mentioned cylinders substantially in contact with each other and at the same speed, said supplementary cylinder being hollow and 'having a perforated peripheral wall, a stencil on the outer surface of the said perforated peripheral wall, means for inking said stencil, means for feeding a strip of paper between the outer surface of said belt and said stencil, said sheet of paper adhering to said belt and means for stripping said sheet of paper from said belt.

6. A printing apparatus having in combination, a rotary cylinder, means passing over said cylinder having thereon a gelatin hectograph lm carrying an image in reverse, a member cooperating with said cylinder having a printing stencil thereon whereby a sheet of paper to be printed may be passed between said film and stencil and be simultaneously printed on both sides.

7. A machine of the class described having in combination, two spaced cylinders having substantially parallel axes, a belt running over said cylinders having an outer surface of hectograph gelatin composition, means for pressing a sheet of paper against said surface, one of said cylinders being of small diameter relative to the other whereby said belt makes a sharp turn around said smaller cylinder and stripping means adjacent said smaller cylinder with which said sheet of paper engages to be stripped from said belt.

8. In a machine of the class described having in combination, two cylinders, a belt having an outer portion carrying a body of hectograph gelatin composition connecting said two cylinders and rotating with said cylinders, means for pressing a sheet of paper against said body of gelatin with the front edge portion of said paper out of Contact with said body and means for stripping said paper from' said body of gelatin disposed in line with the front edge of said sheet whereby said sheet is engaged by said stripping means as said belt bends and passes around one of said cylinders.

9. In a machine of the class described having in combination, two cylinders spaced quite a distance, a belt having an outer portion carrying a body of hectograph gelatin composition extending about said cylinders and traveling with said cylinders in the rotation thereof, whereby said belt has a rectilinear portion between said cylinders, means for pressing a sheet of paper against said body of gelatin with its front edge portion out of contact with said body and means for stripping said paper from said gelatin engaged by said front edge portion of said paper .as said belt and body of gelatin bend and move about one of said cylinders.

10. In a machine of the class described having in combination, two cylinders spaced quite a distance, a belt having an outer portion carrying a body of hectograph gelatin composition extending about said cylinders and traveling with said cylinders in the rotation thereof, whereby said belt has a rectilinear portion between said cylinders, means for pressing a sheet of stiff cardboard against said gelatin in said rectilinear portion whereby said cardboard will continue to move in a straight line and will be stripped from said gelatin as said belt and body of gelatin bends and moves about one of said cylinders.

FRED R. BARTHOLOMEW. 

